Re: Active electrodes

I may have mis-read your project description--if this is something you
already knew, please disregard :)

On Mon, Jun 29, 2015 at 2:53 PM, Charles Z Henry <[email protected]> wrote:
> Note:  There is a problem with using a soundcard for reading EEG's.
> Most commercial soundcards will have a high-pass filter on the input
> (somewhere below 20Hz), and you will have reduced low-frequency data.
>
> So, before you get started, if you already have the soundcard, do some
> tests with a low-frequency signal input and check the characteristics.
>
> Others have implemented a work around by modulating the frequencies
> into a higher band, and then converting back to the original
> frequencies in software.  This is quite a lot of work, and I wouldn't
> recommend it (you could possibly exceed the cost of buying an existing
> solution while trying to build this yourself, and at the expense of
> your time).
>
>
>
>
>
> On Sun, Jun 28, 2015 at 10:19 PM, wikitronic <[email protected]> wrote:
>> Hi,
>>
>> Glad to see more posts coming from this group! The project I'm working on is
>> here.
>>
>> https://github.com/logical/telepathy
>>
>> If anybody is curious. It's nothing special.It is still a prototype so I
>> update it whenever the design changes.
>>
>> My question is where can I find active electrodes? I want dry electrodes and
>> I think some amplification would be an improvement. So I was looking at the
>> openeeg site and all the designs are through hole. I was hoping for a quick
>> pcb design. I have a nice kit full of surface mount parts so I probably have
>> most of what I need. Any open source designs like this?
>>
>>
>> Thanks
>>
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